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Author Topic:   Sealing Holes From SONAR Transducers

kb5xg posted 11-01-2010 11:45 AM ET (US)
[This discussion has been moved to REPAIRS/MODS from THE GAM. Please do not start discussions about repairs in THE GAM.--jimh]
I need to fill transducer holes in transom. Will LOCKTITE-brand marine epoxy be sufficient? I will move the transducer, and the mounting plate will cover where the holes are now. I will redrill two new holes. Should I fill the holes flush with the epoxy? Or, leave [the epoxy] just below the gel coat surface? Should I cover with 3M-5200 [adhesive] sealant? Or, will the epoxy be good enough?
Buckda posted 11-01-2010 11:53 AM ET (US)
I would fill to just below the gelcoat, and if you don't want to replace the gelcoat, I'd use a tinted sealant/caulk to protect the Epoxy from UV degradation/yellowing....and looking like crap.
The best fix would be to use a gelcoat patch.
ConB posted 11-01-2010 01:46 PM ET (US)
I filled mine flush with good epoxy and dabbed a little Grand Banks Beige on the epoxy. It's a little darker than Whaler Desert Tan but not much and I had a can of that.
Con
tedious posted 11-01-2010 03:38 PM ET (US)
Since it's going to be covered by a plate anyway, just fill all the way to the surface and forget about it. Fill with 5200, marine caulk, epoxy - any one will work fine, so use what you have.
Tim
kb5xg posted 11-07-2010 07:25 PM ET (US)
I have spider cracks running out from the holes I drilled will a little 5200 work to fill them and waterproof them? They are less than a 1/2 inch long. The new holes I drilled do not have them as I countersunk through the gel coat. I thought I did on the first ones but evidently not good enough.
jimh posted 11-07-2010 09:11 PM ET (US)
Epoxy is an excellent adhesive. It is typically completely impervious to penetration by water. For gap filling, epoxy adhesive is usually mixed with a filler.
3M-5200 is an adhesive intended for permanent bonding. 3M-5200 is very slow to cure.
If you make a transducer mounting plate from certain ultra-high molecular weight plastics or non-polar plastic materials, they are difficult to bond with normal adhesives. You may want to use a mechanical fastener to hold the transducer plate to the transom, in addition to other adhesives

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Author	Topic: Sealing Holes From SONAR Transducers
kb5xg	posted 11-01-2010 11:45 AM ET (US) [This discussion has been moved to REPAIRS/MODS from THE GAM. Please do not start discussions about repairs in THE GAM.--jimh] I need to fill transducer holes in transom. Will LOCKTITE-brand marine epoxy be sufficient? I will move the transducer, and the mounting plate will cover where the holes are now. I will redrill two new holes. Should I fill the holes flush with the epoxy? Or, leave [the epoxy] just below the gel coat surface? Should I cover with 3M-5200 [adhesive] sealant? Or, will the epoxy be good enough?
Buckda	posted 11-01-2010 11:53 AM ET (US) I would fill to just below the gelcoat, and if you don't want to replace the gelcoat, I'd use a tinted sealant/caulk to protect the Epoxy from UV degradation/yellowing....and looking like crap. The best fix would be to use a gelcoat patch.
ConB	posted 11-01-2010 01:46 PM ET (US) I filled mine flush with good epoxy and dabbed a little Grand Banks Beige on the epoxy. It's a little darker than Whaler Desert Tan but not much and I had a can of that. Con
tedious	posted 11-01-2010 03:38 PM ET (US) Since it's going to be covered by a plate anyway, just fill all the way to the surface and forget about it. Fill with 5200, marine caulk, epoxy - any one will work fine, so use what you have. Tim
kb5xg	posted 11-07-2010 07:25 PM ET (US) I have spider cracks running out from the holes I drilled will a little 5200 work to fill them and waterproof them? They are less than a 1/2 inch long. The new holes I drilled do not have them as I countersunk through the gel coat. I thought I did on the first ones but evidently not good enough.
jimh	posted 11-07-2010 09:11 PM ET (US) Epoxy is an excellent adhesive. It is typically completely impervious to penetration by water. For gap filling, epoxy adhesive is usually mixed with a filler. 3M-5200 is an adhesive intended for permanent bonding. 3M-5200 is very slow to cure. If you make a transducer mounting plate from certain ultra-high molecular weight plastics or non-polar plastic materials, they are difficult to bond with normal adhesives. You may want to use a mechanical fastener to hold the transducer plate to the transom, in addition to other adhesives